Valve for hot-blast stoves



F. H. WILLCOX ET AL VALVE FOR HOT BLAST STOVES Filed July 12; 1923 O 5 W m- I! Q 2 u I w w a Z My b Mm 3 w z .w. mww +1 n, o. l '1! i, llwll l KH j il w W v T F z 3 MM :{lllrl l a GD 7 fO 5 1P i 1 1 one nus L 2 Z J 5 0 z win/(J55.-

Patented Dec. 1, 1925.

UNITED STATES PATENT OFF-ICE.

FREDERICK H. WILLCOX AND JOHN C. HAYES, 51%., OF CHICAGO, ILLINOIS, ASSIGNORS TO FREYN, BRASSERT 8: COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF MAINE.

VALVE FOR HOT-BLA$T STOVES.

Application filedJuly 12, 1923.

To-"cll whom it may concem:

Be it known that we, FREDERICK H. WILL- cox and JOHN C. HAYES, Jr., citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have jointly invented certain new and use i'ul Improvements in Valves for Hot-Blast Stoves, of which the following is a specification. p r

The present invention relates to valves for hot blast stoves.

The work of changing hot blast stoves according to present practice from gas to blast or from blast to gas consumes considerable time and frequently two men are required to change stoves at a single i'urnace.

In prior designs of stoves and burners in practical service, putting on or taking ot? the gas consumes a considerable period of time. .As a typical instance of operation, let'it be assumed that the stove is on gas and that it-is desired to putv it on blast. The stove tender places himself in position on one side of the gas burner and pulls said burner back away from the combustion chamber door opening. He next closes a butterflyvalvc in the gas main to the burner. Hethen goes to the other side of the burner and pushes a heavy gas burner door carried on a trolley into position on the combustion chamber door opening. He then goes around to the first mentioned side ofthelburner and after suitably adjusting the flange of the door. to it the opening, headjusts the yoke and clamps it in position by means of heavyscrew. The clamping of the door requires considerable muscular exertion. It is, a slow process, and the. result is that the sole. task of taking off from a stove will require approximately live. minutes, whichis repeated when the stove is changed from blast to It will accordingly be seen that to change, one stove from'gas to; blast and the adjoining stove from blast tov gas requires period of ten minutes for the gas burners alone. Assuming that the operation of the remaining valves occupies a period'of five minutes, it will be seen that fifteen minutes are required to make the change. Inasmuch the stoves are changed every hour, the loss of time entailed by present practice may readily be appreciated.

An object of the present invention is to port 2.

Serial No. 651,099.

reduce the time required for manipulation of the gas burners in changing from gas to blast or from blast to gas. A further object is to provide mechanism including a water-cooled door and watercooled seat for said door, applicable to a hot blast stove. A further object isto unity the controls of the valve of a hot blast stove whereby various operations in changing from blast to gas or from gas to blast may be more expeditiously accomplished than has hitherto been possible.

Further objects will appear as the description proceeds.

Referring to the drawings-- Figure l is a sectional view taken along the plane indicated by the line 11 o f Figure 2; and I I Figure 2 is a sectional view taken along the plane indicated by the line'22 of Figure 1. i

The numeral lindicates part of the wall of a hotblast stove, said wall being provided with the port 2 through which a combustible mixture of gas and air may be delivered to said stove for heating same The numeral 8 indicates a gas pipe for directing gas to said port. Said, gas pipe is controlled by the butterfly valve 4 and may also be controlled by the valve 5, the valve 5. being controlled by mechanism which will be referred to in detail hereinafter. Mounted in position to direct gas and air to the port 2 is the casing 6, which has controllable ports 7 for admitting air thereto and is provided with the wall 8, which directs air from ports 7 to a region adjacent to the Said casing 6 is provided with the. flaring wall 9, which admits gas to the chamber 6 and allows said gas to mix with the air from ports 7. The numeral of reciprocation in a vertical direction, said gate being shown in closed position in Figure 1.. The gate 10 1s adapted to be lifted vertically into the casing 10 which is l1, which is screw-threaded at its upper end for engagement by the nut 12, which is controlled by the beveled gear 13. Said 10 indicates a gate, 01' valve, which is cap-ahle tight.

nut 12 is held against vertical movement in any preferred way, whereby rotation of said nut effects the vertical movement of the screw-threaded spindle 1". As shown in Figure 2, the beveled gear 12-; is actuated by the beveled pinion 1%, which in turn may be driven by the electric motor 15. The shaft 11 is provided with the adjustable collar 16, which is moved in a vertical direction as shaft 11 is moved vertically. lVhen said collar 16 is near the limit of its movement in an upward direction, said collar 16 will enga e a trip 17 of the rock shaft 18. Said rock shaft 18 has secured thereto a crank arm 19, which controls the rod 20. The rod 20 controls the lever 21, which lever is pivoted for movement about the axis 22. The other end of said lever 21 governs the valve 5, which controls the admission of gas from the pipe 3 to the casing 6.

'The valve 10 preferably takes the form of a hollow chamber, which should be water- The pipes 2823 may be provided for conducting water to the interior of said gate and from the interior of said gate, said pip es 223 being provided with flexible conductors 2d 24i for carrying water to and from pipes 23-e23 and for accommodating changes in the verticalposition of the pipes 23-23. The pipes 23-23 are fixedly mounted in the head 25, which head 25' also has fixed thereto the spindle 11. The pipes 2328 are slidably mounted in the bushings 2626 in the casing 10.

The valve 10 when in closed position may lie in the seat 27, which seat 27 may be water-cooled on either side of the valve 10, the seat 27 being provided with the annular Water chambers 28 and 29. Each of the water chambers 28 and 29 may be provided with suitable pipes 3030 for conducting water thereto and conducting water therefrom. The details of the gate or valve and the seat thereof, considered separately and apart from the remainder of the disclosure, do not constitute the subject matter of the present invention. The valve and seat disclosed approximate closely the hot blast valve and seat shown in the patent to Mathesius N 0. 1,228,463, granted June 5, 1917. The present invention does not relate to hot blast valves, nor has it any particular relation to any valvular structure for the hot blast inlet of a stove. The present invention relates to structure involving the inlet for the combustible mixture of gas and air.

In operating the valve mechanism according to the present invention, it is necessary only to start or stop the motor 15 for controlling the rotation of the shaft 11. Assuming that the gate 10 is in closed position, energization of the motor 15 in a predetermined manner will result in the raising of spindle 11, collar 16 and valve 10. When the collar 16 is close to the upper limit of its movement, said collar will engage the trip 17 to actuate the rock shaft 18. Actuation of the rock shaft 18 will result in the raising of the rod 20, which will rock the lever 21' about its axis 22, resulting in the opening of the gas valve 5, permitting gas to pass into the casing 6. Inasmuch as the valve 10 has been moved to open position at the time of the actuation of the rock shaft 19, the parts are now in position for applying the gas flame for heating the stove. A reverse movement of rotation of the screwthreaded shaft 11. will result in the lower ing of same. Inasmuch as the collar 16 is fixedly mounted on said spindle 11, the lowering of said spindle will permit a rocking movement of the rock shaft 18, resulting in the closing of the gas valve 5. Continued movement of the shaft 11 will result in the lowering of the valve 10 to closed position.

A continuous flow of water may be directed through the interior of the gate 10, the flexible pipes 242 1 being utilized for supplying and leading off said water. The pipes 3030 provide a continuous stream of water through the chambers 28 and 29 of the seats 2727.

By reason of the present invention, the stove may be changed from blast to gas or from gas to blast in a very short interval of time, the hot blast valve and adjoining parts being kept cool at all times.

Though the described embodiment of the present invention illustrates a preferred form, it will be understood that many modifications are possible. It is intended in this patent to cover all such modifications that fall within the scope of the invention as defined by the appended claims.

What is claimed is:

1. In combination, a hot blast stove having a port for the admission of a combustible mixture, a valve seat operatively associated with said port, means for directing a combustible mixture through said port, a valve for said port adapted to have a reciprocating movement, said valve being adapted to seat upon saidvalve seat for closing communication between said stove and said combustible mixture directing means.

2. In combination, in a hot blast stove, means providing a port for the admission of a combustible mixture of gas and air, a valve for said port, means for supplying gas to said port, a valve for opening and closing said gas supply means, and common means for controlling said valves to shut off said gas supply means when said port is closed and to provide communication from said gas supply means to said port when said port is open.

3. In a hot blast stove, in combination, means for conducting gas, valvular means for controlling said conducting means, a chamber Within which said valve may be reciprocating valve for controlling the ad- Withdrawn, means communicating with said mission of gas from said conducting means valve for directing cooling fluid to and leadand of air to said blast furnace, and coming cooling fluid from the interior of said 5 mon operating means for said valve and valve, and common operating means for said I said valvular means. valve and said valvular means.

4. Hot blast mechanism, 7 comprising Signed at Chicago, Illinois this 5 day of means for conducting gas, valvular means July, 1923. V controlling said conducting means, a recip- FREDERICK H. WILLCOX.

10 rocating valve, means providing a gas-tight JOHN C. HAYES, JR. 

